which is the hardest yet the most fascinating math problem you have encountered in your life ?

Question

hero · Answer

Haven't ran into that one yet. They were either hard or fascinating, but not both

anonymous · Answer

Alright then which was the hardest and which was the most fascinating ? ;)

anonymous · Answer

fool most fascinating maths is that one which takes alot of time to solve but once u solve it doesn't remains as fascinating as it was earlier!!!!!!!!!!!!!!!!!

hero · Answer

I don't remember. I'd have to think about it

anonymous · Answer

@sheg:To me the problem is fascinating as long it generates more mathematics I mean make me learn more mathematics.

anonymous · Answer

hmmmmmmmm thats gud buddy keep it up !

asnaseer · Answer

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this is the one for me. it is a deceptively difficult geometry problem. you can only use geometry to solve it - no trig allowed. the only knowledge you need is:
1. properties of an isosceles triangle
2. properties of an equilateral triangle
3. sum of angles in a triangle